#!/usr/bin/env python3
# Copyright (c) 2008 Google, Inc.
# Contributed by Arun Sharma <arun.sharma@google.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#

from perfmon import *
import os
import sys


# Common base class
class Session:
    def __init__(self, events):
        self.system = System()
        self.event_names = events
        self.events = []
        self.fds = []
        for e in events:
            err, encoding = pfm_get_perf_event_encoding(e, PFM_PLM0 | PFM_PLM3,
                                                        None, None)
            self.events.append(encoding)

    def __del__(self):
        pass

    def read(self, fd):
        # TODO: determine counter width
        return os.read(fd, 8)


class SystemWideSession(Session):
    def __init__(self, cpus, events):
        self.cpus = cpus
        self.cpu_fds = []
        Session.__init__(self, events)

    def __del__(self):
        Session.__del__(self)

    def start(self):
        self.cpu_fds = []
        for c in self.cpus:
            self.cpu_fds.append([])
            cur_cpu_fds = self.cpu_fds[-1]
            for e in self.events:
                cur_cpu_fds.append(perf_event_open(e, -1, c, -1, 0))

    def read(self, c, i):
        index = self.cpus.index(c)
        return Session.read(self, self.cpu_fds[index][i])


class PerThreadSession(Session):
    def __init__(self, pid, events):
        self.pid = pid
        Session.__init__(self, events)

    def __del__(self):
        Session.__del__(self)

    def start(self):
        for e in self.events:
            self.fds.append(perf_event_open(e, self.pid, -1, -1, 0))

    def read(self, i):
        return Session.read(self, self.fds[i])
